Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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EFFECTS OF CONVERGENT ANGLE OF NOZZLE CONTRACTION ON HIGH-SPEED OPTICAL FIBER COATING FLOW

노즐 축소부 수렴각이 고속 광섬유 피복유동에 미치는 영향

  • Park, S. (Dept. of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Kim, K. (Dept. of Mechanical System Engineering, Kumoh National Institute of Technology) ;
  • Kwak, H.S. (Dept. of Mechanical System Engineering, Kumoh National Institute of Technology)
  • 박신 (금오공과대학교 기계시스템공학과) ;
  • 김경진 (금오공과대학교 기계시스템공학과) ;
  • 곽호상 (금오공과대학교 기계시스템공학과)
  • Received : 2016.08.22
  • Accepted : 2016.12.22
  • Published : 2016.12.31
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Abstract

A numerical study is conducted on the optical fiber coating flow in a primary coating nozzle consisting of three major parts: a resin chamber, a contraction and a coating die of small diameter. The flow is driven by the optical fiber penetrating the center of the nozzle at a high speed. The axisymmetric two-dimensional flow and heat transfer induced by viscous heating are examined based on the laminar flow assumption. Numerical experiments are performed with varying the convergent angle of nozzle contraction and the optical fiber drawing speed. The numerical results show that for high drawing speed greater than 30 m/s, there is a transition in the essential flow features depending on the convergent angle. For a large convergent angle greater than $30^{\circ}$, unfavorable multicellular flow structures are monitored, which could be associated with wall boundary-layer separation. In the regime of small convergent angle, as the angle increases, the highest resin temperature at the exit of die and the coating thickness decrease but the sensitivity of coating thickness on drawing speed and the maximum shear strain of resin on the optical fiber increase. The effects of the convergent angle are discussed in view of compromise searching for an appropriate angle for high-speed optical fiber coating.

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References

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